Pretty much ANY instrument is as hard as the player wants it to be. Any instrument is EASY if you're just fooling around with it. But every instrument if taken seriously will be a challenge to get to a high level of playing prowess with it.

Anyone can learn a few rudimentary things on an instrument, but can you PLAY it, like one of the MASTERS of the instrument??

That's why they're ALL difficult.

I can EASILY play electric bass on tons of 1980's Foreigner tunes, but can I play like Geddy Lee, or Jaco Pastorius?? HELL no!!!! The level of difficulty has gone UP!!